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Re: Tektronix 2225 power supply startup ticking / buzzing

 

Huh? Are we talking about the same oscilloscope?

The 2225 (and the 2235 series) does not rely on any feedback between
the high voltage outputs for the CRT and the regulator or at least I
do not see any. Feedback is only from the -8.6 volt supply.

On Tue, 21 Nov 2017 09:29:22 -0500, you wrote:

When the multiplier is disconnected, so is the HV sensing
resistor chain used for feedback. The disconnected sensing
resistor chain tells the control circuit that the HV is lower
(zero) than the regulation set point, and the control circuit
turns the inverter all the way up in an attempt to regulate.
This puts the output voltage of the transformer up to a value
that is about twice the normal operating voltage, as you have
demonstrated.

...

-Chuck Harris
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